When the family accept her I feel okay, that's actually good, but I still feel something is missing. Then, when Rin herself come to looking for Rosalia, that's it, now, they are really become Rosalin.
I disagree though with wanting someone to find out MC condition. I don't think he want pity from another person, and instead he work out his little time to make something worthwhile: the festival, for the people he care about.
I genuinely wanted the author to keep his illness secret untill the...